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PENDULUM. What’s a pendulum anyway??. What is a pendulum scientifically important??. WRONG IDEAS. The earth is flat. The sun, moon, stars rotate the earth each day. In the 6th century B.C. － ARISTARCHUS 1543, COPERNICUS. NEWTON.

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## PENDULUM

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**WRONG IDEAS**The earth is flat. The sun, moon, stars rotate the earth each day.**In the 6th century B.C. －ARISTARCHUS**• 1543, COPERNICUS**In 1851, a French physicist named FOUCAULT found a way to**prove the earth rotates via a OENDULUM FOUCAULT’s first demonstration FOUCAULT’s second demonstration FOUCAULT’s third demonstration**TODAY -- you can see this FOUCAULT PENDULUM demonstration**yourself at theCALIFORNIA ACADEMY OF SCIENCES.**Why does the pendulum demonstrate the rotation of the**earth?? Let's consider -- what ARE the forces acting on the pendulum?**We must understand the difference between 2 kinds of motions**Twisting Traveling**If the Pendulum was at the EQUATOR**If the Pendulum was at the POLE**Degrees of TWIST per day may be determined mathematically by**this formula and can be demonstrated by using the pendulum Latitude = angular distance of a place from the equator**EXAMPLE**by a Foucault Pendulum, man can demonstrate at any point on the Earth's surface (except on the equator) that the earth rotates--

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